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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Interest Payable, Current $ 28,529 $ 27,770
Employee-related Liabilities, Current 70,988 88,512
Other Accrued Liabilities, Current 27,871 15,008
Accrued liabilities $ 127,388 $ 131,290